powerpc/64/build: only include .opd with ELFv1

ELFv2 does not use function descriptors so .opd is not required.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220916040755.2398112-6-npiggin@gmail.com

arch/powerpc/kernel/vmlinux.lds.S

@@ -180,11 +180,13 @@ SECTIONS
 	SOFT_MASK_TABLE(8)
 	RESTART_TABLE(8)
 
+#ifdef CONFIG_PPC64_ELF_ABI_V1
 	.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
 		__start_opd = .;
 		KEEP(*(.opd))
 		__end_opd = .;
 	}
+#endif
 
 	. = ALIGN(8);
 	__stf_entry_barrier_fixup : AT(ADDR(__stf_entry_barrier_fixup) - LOAD_OFFSET) {